This standard specifies the requirements, test methods, inspection rules, packaging and storage of rubber coatings for belt conveyor rollers in coal mines (hereinafter referred to as rubber coatings). This standard applies to flame retardant rubber coatings on the surface of metal rollers for belt conveyors in coal mines. MT 962-2005 Technical conditions for rubber coatings for belt conveyor rollers in coal mines MT962-2005 Standard download decompression password: www.bzxz.net

ICS 83. 140, 0
Registration No.: 16793—2005wwW.bzxz.Net
Coal Industry Standard of the People's Republic of China
MT 962—2005
Technical Conditions for Rubber Covering Layer of Belt Conveyor Roller in Coal Mine
Issued on September 23, 2005
National Development and Reform Commission
Implementation on February 1, 2006
Chapter 3 of this standard is mandatory, and the rest are recommended. This standard is proposed by the Science and Technology Development Department of China Coal Industry Association. This standard is under the jurisdiction of the Coal Refining Safety Standardization Technical Committee! : Drafting unit of this standard: Shanghai Port Branch of China Coal Research Institute. The main drafter of this standard is Zheng Hong, principal officer, Shang Huo, MT$62—20Q5
1 Scope
Technical conditions for rubber covering of coal shovel belt conveyor cylinder
MT962—20C5
This standard specifies the requirements, test methods, inspection period, packaging and storage of coal smoldering rubber covering on the roller of belt conveyor (hereinafter referred to as cotton covering). This standard is widely used in the inspection of the surface of coal conveyor belt conveyor rollers for coal shovel belt conveyor. 2 Normative references
The following documents become clauses of this standard through reference in the standard: Any document used before the specified date and all its accompanying amendments (including errors or revisions) are not applicable to this standard. However, if the parties cannot reach an agreement on the standard, the latest version of this document may be used. It is not a specified date and its latest version is applicable to this standard. GB/T523-199% chemical rubber or hot rubber cavity tensile strain energy is determined by M1=37, 1994 G/T531-1999 rubber pre-precision H hardness test Fangda (idJS769: 19861G/T312-2 (heart 1 system recovery or thermoplastic ladder cavity hot air rapid aging and thermal test: ISO1XS: 1593) G/T98671588 Rubber grinding grease determination (rotating frequency simple grinding machine method) S0154: 1985) H15254-10 Fluidized rubber and metal contact 180\ intense separation test (1S010-2.) MT13-1UU5 Coal mine underground exchange compound system General test method and judgment of magnetic resistance and static electricity List 3 Requirements
3.1 Appearance
The surface of the rubber package is smooth, 3.2 Physical properties of rubber coating
3.2.1 The tensile strength of the rubber coating layer should be no less than 15.5MPa. 3.2.2 The breaking length of the rubber coating layer should be less than 30%. 3.2.3 The tensile strength of the rubber coating layer should be 60-75SIA. 3.2.4 The tensile strength of the rubber coating layer should be less than 12Gr. 3.2.5 The tensile strength change rate of the rubber coating layer after 70% hot air treatment should be 25%-2%, and the breaking length change rate should be 25%-25%. 3.3 Inspection of rubber coating 3.3.1 The high strength of the rubber coating on the metal tube after heat curing (180% metal bonding 721) should be not less than 4.8kN/m. 3.3.2 The high insulation strength of the rubber coating on the metal tube after heat curing (130% metal bonding) should be not less than 9.8kN/m 3.4 Flame retardant properties The burning performance of each rubber layer under alcohol burner and fine lamp should meet the requirements of Table 1 3.5 Electrical conductivity The arithmetic average of the surface of the rubber coating and the lower surface should not exceed 1.1 MT 962—2005
Color
West lamp
4 Test method
Illumination burning time
4.1 External test method is adopted.
Alcohol torch, alcohol lamp combustion performance
Average burning time
4.2 The tensile performance test of the core rubber layer is carried out in accordance with the provisions of 3/15311999. 4.3 The strength test of the rubber layer is carried out in accordance with the provisions of 3/15311999. 4.4 The wear test of the rubber layer is carried out in accordance with the provisions of GH/1857-108. 4.5 The thermal stability test of the core cavity layer is carried out in accordance with the provisions of BT3512-231: 4.5.1 The calculation of the tensile elasticity change rate is shown in formula (1): α --.
Upper:
Change of tensile strength after aging:
8.-Tensile strength after aging, in Newton per meter (N/m):-Tensile strength before aging, in Newton per meter (N/m?. 4.5.2 Change rate of tensile elongation after aging, see formula (2>: P.-
Change rate of elongation at break after aging:
Elongation at break after aging:
New elongation before aging
4.6 The test of the separation strength of the amine coating layer shall be carried out in accordance with the provisions of GH/T15254-1991. 4. The burner burning test shall be carried out in accordance with the provisions of MT113-15, Section 4.1. 4.8 Burning test with sprinkler The performance test is carried out in accordance with the provisions of 4.2 of MT113995. 4.9 The performance test is carried out in accordance with the provisions of Section 5 of MT113-1095. 5.1 Factory inspection The maximum position of the flameless combustion is 5.1.1 The quality inspection department is responsible for the quarantine of each product. The batch of 1300kg (less than 100kg is a batch) but less than one week, the product shall be inspected at least ten times. The product can only be shipped after the inspection is qualified and the certificate is issued. The product shall be inspected at least once a quarter. 5.1.2 Inspection items are shown in Table 2. 5.2 Type inspection 5.2. 1. Type inspection shall be carried out in the following circumstances: trial production and appraisal of new products or super products during production change; a. After production, if there are major changes in structure, material, or process that may affect product performance); during normal production, inspection shall be carried out once every 2 years; after production is resumed after the product has been discontinued; 6. When the factory inspection results are consistent with the last type inspection: the national safety production supervision and inspection agency, etc. shall conduct a comprehensive inspection as required. 5.2.2 Room test items See Table 2. Energy items Pull strength Test length after aging Break length after aging Set rate Rubber bag value and gold morning thorn High strength Light board stove porridge Light explosion energy Single electrical performance "" indicates test, "" indicates no test. Factory test according to MT 9G2—2005 5.2.3 The sample for room test should be taken from the qualified products of factory inspection, and the sampling number is 50kg. The sample of separation strength between rubber bag layer and gold is provided by the manufacturer. 5.3 Judgment rules 5. 3. 1Qualified judgment conditions:
Any of the following conditions is qualified: a) All the inspection items are qualified!
b) One inspection item is unqualified, and the test group will double the inspection to check the item. 5.3.2 Small-scale qualification judgment conditions
Any of the following conditions is unqualified: a) One inspection item is unqualified, and the test group will double the inspection to check the item! b) Two inspection items are unqualified. Packaging and storage ||tt| |6.1 Packaging
The plastic packaging layer of the package should be covered with packaging materials, and there should be quality inspection certificates on the packaging. 6.2 Storage
The plastic packaging layer should be stored in an environment with a temperature of -10~10℃ and a relative visibility of 50%~%. The surface of the plastic packaging layer should be kept clean, avoid direct sunlight, and avoid contact with acid, brain, inflammation, plasticizers and other materials that may affect the quality of the product: 1m away from commercial heat sources, and the storage period should be regular.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.